Data Sheet: Nickel-Chromium Alloys

Learn more about each nickel speciality alloy

Nickel-Chromium Alloys: Heating Element & Resistance

These alloys are especially characterized by high resistivity and high resistance to oxidation and chemical corrosion. They are suitable for making high-value electrical resistors, heating wires, heating cords and cables.

NiCr 80:20 is suitable for heating elements used for temperatures upto 1200°C. This is used for electrical cooking equipment, precison resistors. Oxidized wires of these alloys display better insulation properties.

NiCr 70:30 is suitable for heating elements used for temperatures upto 1230°C for industrial furnaces which have alternating oxidizing, or reducing atmosphere. This alloy has excellent corrosion resistance and long life in air and controlled atmospheres.

NiCr 60:15 is suitable for heating elements used for temperatures upto 1150°C. This is used for electrically heated equipment, high resistance and potientiometer resistors.

NiCr 40:20 is suitable for heating elements used for temperatures upto 1050°C. This is used for domestic heating appliances, furnaces in carburizing, or semi-reducing atmospheres.

NiCr 30:20 / NiCr 20:25 are suitable for heating elements used for temperatures upto 1050°C. Inspite of relatively high Fe content, these alloys are resistant to oxidation and chemical corrosion. They are used for making heating elements of cooking equipment, heating cords and cables.

Specifications

Alloy

ASTM

Werkstoff Nr

UNS designation

DIN

NiCr 80:20

B344

2.4869

N06003

17470 / 17471

NiCr 70:30

-

2.4658

N06003

17470

NiCr 60:15

-

2.4867

N06004

17470 / 17471

NiCr 40:20

-

-

-

-

NiCr 30:20

B344

1.4860

-

17470

NiCr 20:25

-

1.4843

-

17470

Nominal Chemical Composition (%)

Alloy

Ni

Mn

Fe

Si

Cr

C

Al

Cu

NiCr 80:20

Balance

Max 1.0

Max 1.0

1.0-1.5

19-21

Max 0.10

Max 0.30

Max 0.50

NiCr 70:30

Balance

Max 1.0

Max 1.0

1.0-3.0

28-32

Max 0.10

Max 0.20

Max 0.50

NiCr 60:15

Min 57.0

Max 1.0

Max 1.0

1.0-1.5

14-17

Max 0.10

Max 0.30

Max 0.50

NiCr 40:20

Min 37.0

Max 1.0

Balance

1.8-3.0

18-22

Max 0.10

Max 0.30

Max 0.50

NiCr 30:20

Min 28.0

Max 1.0

Balance

1.8-3.0

18-22

Max 0.10

Max 0.30

Max 0.50

NiCr 20:25

Min 18.0

Max 1.0

Balance

1.0-1.5

23-27

Max 0.10

Max 0.30

Max 0.50

Physical & Mechanical Properties (at room temperature)

Alloy

Density

Tensile Strength

Elongation

Specific Heat at 20°C

Coeff. of Linear Expansion b/w 20-1000 °C

Max. Operating Temp of Heating Element

g/cm³

N/mm²

% at L0=100 mm

J/kg°C

10-6/K

°C

NiCr 80:20

8.41

700-900

25-35

435

17

1200

NiCr 70:30

8.16

800-950

25-30

460

17

1250

NiCr 60:15

8.25

700-850

25-35

450

17

1150

NiCr 40:20

7.95

700-850

25-35

460

19

1050

NiCr 30:20

7.90

650-800

25-35

500

19

1050

NiCr 20:25

7.80

600-800

25-35

500

14

1050

Electrical Properties

Alloy

Specific Resistance(Electrical Resistivity) at 20°C

Temp Coeff of Resistancex 10-6/°C

µΩ-cm

Value

Temp Range

NiCr 80:20

108

60

20-1000°C

NiCr 70:30

118

110

20-1000°C

NiCr 60:15

112

170

20-1000°C

NiCr 40:20

105

60

20-1000°C

NiCr 30:20

104

60

20-1000°C

NiCr 20:25

95

60

20-1000°C

For resistance in Ω/m of any size, divide the above resistivity with cross-sectional area in mm² of the size x 100: